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3.3.5 Off Battery
The battery plant can be disconnected from the UPS, if required for battery maintenance, by opening
the module battery disconnect (MBD) circuit breaker. In this situation the UPS module will continue
to supply conditioned power to the critical load, but if input power fails the UPS system cannot sup-
ply power to the load.
Figure 46 Load on UPS—battery not available
!
CAUTION
When the UPS system is operating with the module battery disconnect (MBD) circuit
breaker(s) open, the critical load is not protected from loss of the utility source power.
OUTPUT
CB
Controls
Bypass CB
INPUT
CB
Static
Bypass
Switch
RIB
BFB
Critical
Load
AC Output
MBD
Static
Switch
Disconnects
THREE BREAKER MAINTENANCE BYPASS SWITCHBOARD
CONTROL POWER
UPS MODULE
MAIN INPUT
SWITCHGEAR
Rectifier/
Charger
Inverter
Battery
BIB
MBB
MIB